"There was an incident during training yesterday. There was a scuffle between two players, and I discussed it with them after the session," he said at a news conference ahead of Sunday's match against Fortuna Dusseldorf.

"Both apologised for their behaviour, and they are very sorry it came to this. There will be no fines."

Kovac did not take questions on the incident but said: "There are emotions in training, and you can also see the upside -- we are alive!"

On Thursday, Bild reported that Lewandowski and Coman had clashed on the pitch at a behind closed doors training session.